The answer depends on the units used for 400. It should be blindingly obvious to anybody that 400 nanometres and 400 metres will give very different answers.
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fraction: 77/10001 km = 1000 m77m/1km = 77m/1000m = 77/1000
235/1000 or 0.235.
It is 1/(1/10) = 10.
700/400 = 7/4 in fraction
Fraction . . . 400/1 Decimal . . . 400.000